AH01079: failed to make connection to backend: httpd-UDS

In order to fix this issue we need to restart the improved PHP handler ( ea-php72-php-fpm.service )

# systemctl restart ea-php72-php-fpm.service

It seems there is an issue with PHP-FPM mode (Mod-PHP works fine).
I installed version p3 on CentOS 6.5 succesfully and works OK.

If problem exists, remove PHP-FPM module

FPM (FastCGI Process Manager) is an alternative PHP FastCGI implementation with some additional features (mostly) useful for heavy-loaded sites.

These features include:

  • advanced process management with graceful stop/start;
  • ability to start workers with different uid/gid/chroot/environment, listening on different ports and using different php.ini (replaces safe_mode);
  • stdout and stderr logging;
  • emergency restart in case of accidental opcode cache destruction;
  • accelerated upload support;
  • “slowlog” – logging scripts (not just their names, but their PHP backtraces too, using ptrace and similar things to read remote process’ execute_data) that are executed unusually slow;
  • fastcgi_finish_request() – special function to finish request and flush all data while continuing to do something time-consuming (video converting, stats processing etc.);
  • dynamic/static child spawning;
  • basic SAPI status info (similar to Apache mod_status);
  • php.ini-based config file.

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